2 * CXL Flash Device Driver
4 * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
5 * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
7 * Copyright (C) 2015 IBM Corporation
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 #include <linux/delay.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/pci.h>
20 #include <asm/unaligned.h>
24 #include <scsi/scsi_cmnd.h>
25 #include <scsi/scsi_host.h>
26 #include <uapi/scsi/cxlflash_ioctl.h>
32 MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME
);
33 MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>");
34 MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>");
35 MODULE_LICENSE("GPL");
38 * process_cmd_err() - command error handler
39 * @cmd: AFU command that experienced the error.
40 * @scp: SCSI command associated with the AFU command in error.
42 * Translates error bits from AFU command to SCSI command results.
44 static void process_cmd_err(struct afu_cmd
*cmd
, struct scsi_cmnd
*scp
)
46 struct afu
*afu
= cmd
->parent
;
47 struct cxlflash_cfg
*cfg
= afu
->parent
;
48 struct device
*dev
= &cfg
->dev
->dev
;
49 struct sisl_ioarcb
*ioarcb
;
50 struct sisl_ioasa
*ioasa
;
59 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_UNDERRUN
) {
61 scsi_set_resid(scp
, resid
);
62 dev_dbg(dev
, "%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
63 __func__
, cmd
, scp
, resid
);
66 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
) {
67 dev_dbg(dev
, "%s: cmd underrun cmd = %p scp = %p\n",
69 scp
->result
= (DID_ERROR
<< 16);
72 dev_dbg(dev
, "%s: cmd failed afu_rc=%02x scsi_rc=%02x fc_rc=%02x "
73 "afu_extra=%02x scsi_extra=%02x fc_extra=%02x\n", __func__
,
74 ioasa
->rc
.afu_rc
, ioasa
->rc
.scsi_rc
, ioasa
->rc
.fc_rc
,
75 ioasa
->afu_extra
, ioasa
->scsi_extra
, ioasa
->fc_extra
);
77 if (ioasa
->rc
.scsi_rc
) {
78 /* We have a SCSI status */
79 if (ioasa
->rc
.flags
& SISL_RC_FLAGS_SENSE_VALID
) {
80 memcpy(scp
->sense_buffer
, ioasa
->sense_data
,
82 scp
->result
= ioasa
->rc
.scsi_rc
;
84 scp
->result
= ioasa
->rc
.scsi_rc
| (DID_ERROR
<< 16);
88 * We encountered an error. Set scp->result based on nature
91 if (ioasa
->rc
.fc_rc
) {
92 /* We have an FC status */
93 switch (ioasa
->rc
.fc_rc
) {
94 case SISL_FC_RC_LINKDOWN
:
95 scp
->result
= (DID_REQUEUE
<< 16);
97 case SISL_FC_RC_RESID
:
98 /* This indicates an FCP resid underrun */
99 if (!(ioasa
->rc
.flags
& SISL_RC_FLAGS_OVERRUN
)) {
100 /* If the SISL_RC_FLAGS_OVERRUN flag was set,
101 * then we will handle this error else where.
102 * If not then we must handle it here.
103 * This is probably an AFU bug.
105 scp
->result
= (DID_ERROR
<< 16);
108 case SISL_FC_RC_RESIDERR
:
109 /* Resid mismatch between adapter and device */
110 case SISL_FC_RC_TGTABORT
:
111 case SISL_FC_RC_ABORTOK
:
112 case SISL_FC_RC_ABORTFAIL
:
113 case SISL_FC_RC_NOLOGI
:
114 case SISL_FC_RC_ABORTPEND
:
115 case SISL_FC_RC_WRABORTPEND
:
116 case SISL_FC_RC_NOEXP
:
117 case SISL_FC_RC_INUSE
:
118 scp
->result
= (DID_ERROR
<< 16);
123 if (ioasa
->rc
.afu_rc
) {
124 /* We have an AFU error */
125 switch (ioasa
->rc
.afu_rc
) {
126 case SISL_AFU_RC_NO_CHANNELS
:
127 scp
->result
= (DID_NO_CONNECT
<< 16);
129 case SISL_AFU_RC_DATA_DMA_ERR
:
130 switch (ioasa
->afu_extra
) {
131 case SISL_AFU_DMA_ERR_PAGE_IN
:
133 scp
->result
= (DID_IMM_RETRY
<< 16);
135 case SISL_AFU_DMA_ERR_INVALID_EA
:
137 scp
->result
= (DID_ERROR
<< 16);
140 case SISL_AFU_RC_OUT_OF_DATA_BUFS
:
142 scp
->result
= (DID_ALLOC_FAILURE
<< 16);
145 scp
->result
= (DID_ERROR
<< 16);
151 * cmd_complete() - command completion handler
152 * @cmd: AFU command that has completed.
154 * Prepares and submits command that has either completed or timed out to
155 * the SCSI stack. Checks AFU command back into command pool for non-internal
156 * (cmd->scp populated) commands.
158 static void cmd_complete(struct afu_cmd
*cmd
)
160 struct scsi_cmnd
*scp
;
162 struct afu
*afu
= cmd
->parent
;
163 struct cxlflash_cfg
*cfg
= afu
->parent
;
164 struct device
*dev
= &cfg
->dev
->dev
;
169 if (unlikely(cmd
->sa
.ioasc
))
170 process_cmd_err(cmd
, scp
);
172 scp
->result
= (DID_OK
<< 16);
174 cmd_is_tmf
= cmd
->cmd_tmf
;
176 dev_dbg_ratelimited(dev
, "%s:scp=%p result=%08x ioasc=%08x\n",
177 __func__
, scp
, scp
->result
, cmd
->sa
.ioasc
);
182 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
183 cfg
->tmf_active
= false;
184 wake_up_all_locked(&cfg
->tmf_waitq
);
185 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
188 complete(&cmd
->cevent
);
192 * context_reset() - reset command owner context via specified register
193 * @cmd: AFU command that timed out.
194 * @reset_reg: MMIO register to perform reset.
196 static void context_reset(struct afu_cmd
*cmd
, __be64 __iomem
*reset_reg
)
200 struct afu
*afu
= cmd
->parent
;
201 struct cxlflash_cfg
*cfg
= afu
->parent
;
202 struct device
*dev
= &cfg
->dev
->dev
;
204 dev_dbg(dev
, "%s: cmd=%p\n", __func__
, cmd
);
206 writeq_be(rrin
, reset_reg
);
208 rrin
= readq_be(reset_reg
);
211 /* Double delay each time */
213 } while (nretry
++ < MC_ROOM_RETRY_CNT
);
215 dev_dbg(dev
, "%s: returning rrin=%016llx nretry=%d\n",
216 __func__
, rrin
, nretry
);
220 * context_reset_ioarrin() - reset command owner context via IOARRIN register
221 * @cmd: AFU command that timed out.
223 static void context_reset_ioarrin(struct afu_cmd
*cmd
)
225 struct afu
*afu
= cmd
->parent
;
227 context_reset(cmd
, &afu
->host_map
->ioarrin
);
231 * context_reset_sq() - reset command owner context w/ SQ Context Reset register
232 * @cmd: AFU command that timed out.
234 static void context_reset_sq(struct afu_cmd
*cmd
)
236 struct afu
*afu
= cmd
->parent
;
238 context_reset(cmd
, &afu
->host_map
->sq_ctx_reset
);
242 * send_cmd_ioarrin() - sends an AFU command via IOARRIN register
243 * @afu: AFU associated with the host.
244 * @cmd: AFU command to send.
247 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
249 static int send_cmd_ioarrin(struct afu
*afu
, struct afu_cmd
*cmd
)
251 struct cxlflash_cfg
*cfg
= afu
->parent
;
252 struct device
*dev
= &cfg
->dev
->dev
;
258 * To avoid the performance penalty of MMIO, spread the update of
259 * 'room' over multiple commands.
261 spin_lock_irqsave(&afu
->rrin_slock
, lock_flags
);
262 if (--afu
->room
< 0) {
263 room
= readq_be(&afu
->host_map
->cmd_room
);
265 dev_dbg_ratelimited(dev
, "%s: no cmd_room to send "
266 "0x%02X, room=0x%016llX\n",
267 __func__
, cmd
->rcb
.cdb
[0], room
);
269 rc
= SCSI_MLQUEUE_HOST_BUSY
;
272 afu
->room
= room
- 1;
275 writeq_be((u64
)&cmd
->rcb
, &afu
->host_map
->ioarrin
);
277 spin_unlock_irqrestore(&afu
->rrin_slock
, lock_flags
);
278 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__
,
279 cmd
, cmd
->rcb
.data_len
, cmd
->rcb
.data_ea
, rc
);
284 * send_cmd_sq() - sends an AFU command via SQ ring
285 * @afu: AFU associated with the host.
286 * @cmd: AFU command to send.
289 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
291 static int send_cmd_sq(struct afu
*afu
, struct afu_cmd
*cmd
)
293 struct cxlflash_cfg
*cfg
= afu
->parent
;
294 struct device
*dev
= &cfg
->dev
->dev
;
299 newval
= atomic_dec_if_positive(&afu
->hsq_credits
);
301 rc
= SCSI_MLQUEUE_HOST_BUSY
;
305 cmd
->rcb
.ioasa
= &cmd
->sa
;
307 spin_lock_irqsave(&afu
->hsq_slock
, lock_flags
);
309 *afu
->hsq_curr
= cmd
->rcb
;
310 if (afu
->hsq_curr
< afu
->hsq_end
)
313 afu
->hsq_curr
= afu
->hsq_start
;
314 writeq_be((u64
)afu
->hsq_curr
, &afu
->host_map
->sq_tail
);
316 spin_unlock_irqrestore(&afu
->hsq_slock
, lock_flags
);
318 dev_dbg(dev
, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p "
319 "head=%016llx tail=%016llx\n", __func__
, cmd
, cmd
->rcb
.data_len
,
320 cmd
->rcb
.data_ea
, cmd
->rcb
.ioasa
, rc
, afu
->hsq_curr
,
321 readq_be(&afu
->host_map
->sq_head
),
322 readq_be(&afu
->host_map
->sq_tail
));
327 * wait_resp() - polls for a response or timeout to a sent AFU command
328 * @afu: AFU associated with the host.
329 * @cmd: AFU command that was sent.
332 * 0 on success, -1 on timeout/error
334 static int wait_resp(struct afu
*afu
, struct afu_cmd
*cmd
)
336 struct cxlflash_cfg
*cfg
= afu
->parent
;
337 struct device
*dev
= &cfg
->dev
->dev
;
339 ulong timeout
= msecs_to_jiffies(cmd
->rcb
.timeout
* 2 * 1000);
341 timeout
= wait_for_completion_timeout(&cmd
->cevent
, timeout
);
343 afu
->context_reset(cmd
);
347 if (unlikely(cmd
->sa
.ioasc
!= 0)) {
348 dev_err(dev
, "%s: cmd %02x failed, ioasc=%08x\n",
349 __func__
, cmd
->rcb
.cdb
[0], cmd
->sa
.ioasc
);
357 * send_tmf() - sends a Task Management Function (TMF)
358 * @afu: AFU to checkout from.
359 * @scp: SCSI command from stack.
360 * @tmfcmd: TMF command to send.
363 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
365 static int send_tmf(struct afu
*afu
, struct scsi_cmnd
*scp
, u64 tmfcmd
)
367 struct cxlflash_cfg
*cfg
= shost_priv(scp
->device
->host
);
368 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
369 struct device
*dev
= &cfg
->dev
->dev
;
374 /* When Task Management Function is active do not send another */
375 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
377 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
380 cfg
->tmf_active
= true;
381 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
387 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
388 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
389 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
390 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
391 cmd
->rcb
.req_flags
= (SISL_REQ_FLAGS_PORT_LUN_ID
|
392 SISL_REQ_FLAGS_SUP_UNDERRUN
|
393 SISL_REQ_FLAGS_TMF_CMD
);
394 memcpy(cmd
->rcb
.cdb
, &tmfcmd
, sizeof(tmfcmd
));
396 rc
= afu
->send_cmd(afu
, cmd
);
398 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
399 cfg
->tmf_active
= false;
400 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
404 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
405 to
= msecs_to_jiffies(5000);
406 to
= wait_event_interruptible_lock_irq_timeout(cfg
->tmf_waitq
,
411 cfg
->tmf_active
= false;
412 dev_err(dev
, "%s: TMF timed out\n", __func__
);
415 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
421 * cxlflash_driver_info() - information handler for this host driver
422 * @host: SCSI host associated with device.
424 * Return: A string describing the device.
426 static const char *cxlflash_driver_info(struct Scsi_Host
*host
)
428 return CXLFLASH_ADAPTER_NAME
;
432 * cxlflash_queuecommand() - sends a mid-layer request
433 * @host: SCSI host associated with device.
434 * @scp: SCSI command to send.
436 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure
438 static int cxlflash_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*scp
)
440 struct cxlflash_cfg
*cfg
= shost_priv(host
);
441 struct afu
*afu
= cfg
->afu
;
442 struct device
*dev
= &cfg
->dev
->dev
;
443 struct afu_cmd
*cmd
= sc_to_afucz(scp
);
444 struct scatterlist
*sg
= scsi_sglist(scp
);
445 u16 req_flags
= SISL_REQ_FLAGS_SUP_UNDERRUN
;
449 dev_dbg_ratelimited(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
450 "cdb=(%08x-%08x-%08x-%08x)\n",
451 __func__
, scp
, host
->host_no
, scp
->device
->channel
,
452 scp
->device
->id
, scp
->device
->lun
,
453 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
454 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
455 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
456 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
459 * If a Task Management Function is active, wait for it to complete
460 * before continuing with regular commands.
462 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
463 if (cfg
->tmf_active
) {
464 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
465 rc
= SCSI_MLQUEUE_HOST_BUSY
;
468 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
470 switch (cfg
->state
) {
474 dev_dbg_ratelimited(dev
, "%s: device is in reset\n", __func__
);
475 rc
= SCSI_MLQUEUE_HOST_BUSY
;
478 dev_dbg_ratelimited(dev
, "%s: device has failed\n", __func__
);
479 scp
->result
= (DID_NO_CONNECT
<< 16);
488 cmd
->rcb
.data_len
= sg
->length
;
489 cmd
->rcb
.data_ea
= (uintptr_t)sg_virt(sg
);
495 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
496 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
497 cmd
->rcb
.port_sel
= CHAN2PORTMASK(scp
->device
->channel
);
498 cmd
->rcb
.lun_id
= lun_to_lunid(scp
->device
->lun
);
500 if (scp
->sc_data_direction
== DMA_TO_DEVICE
)
501 req_flags
|= SISL_REQ_FLAGS_HOST_WRITE
;
503 cmd
->rcb
.req_flags
= req_flags
;
504 memcpy(cmd
->rcb
.cdb
, scp
->cmnd
, sizeof(cmd
->rcb
.cdb
));
506 rc
= afu
->send_cmd(afu
, cmd
);
512 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe
513 * @cfg: Internal structure associated with the host.
515 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg
*cfg
)
517 struct pci_dev
*pdev
= cfg
->dev
;
519 if (pci_channel_offline(pdev
))
520 wait_event_timeout(cfg
->reset_waitq
,
521 !pci_channel_offline(pdev
),
522 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT
);
526 * free_mem() - free memory associated with the AFU
527 * @cfg: Internal structure associated with the host.
529 static void free_mem(struct cxlflash_cfg
*cfg
)
531 struct afu
*afu
= cfg
->afu
;
534 free_pages((ulong
)afu
, get_order(sizeof(struct afu
)));
540 * stop_afu() - stops the AFU command timers and unmaps the MMIO space
541 * @cfg: Internal structure associated with the host.
543 * Safe to call with AFU in a partially allocated/initialized state.
545 * Cancels scheduled worker threads, waits for any active internal AFU
546 * commands to timeout, disables IRQ polling and then unmaps the MMIO space.
548 static void stop_afu(struct cxlflash_cfg
*cfg
)
550 struct afu
*afu
= cfg
->afu
;
552 cancel_work_sync(&cfg
->work_q
);
555 while (atomic_read(&afu
->cmds_active
))
557 if (afu_is_irqpoll_enabled(afu
))
558 irq_poll_disable(&afu
->irqpoll
);
559 if (likely(afu
->afu_map
)) {
560 cxl_psa_unmap((void __iomem
*)afu
->afu_map
);
567 * term_intr() - disables all AFU interrupts
568 * @cfg: Internal structure associated with the host.
569 * @level: Depth of allocation, where to begin waterfall tear down.
571 * Safe to call with AFU/MC in partially allocated/initialized state.
573 static void term_intr(struct cxlflash_cfg
*cfg
, enum undo_level level
)
575 struct afu
*afu
= cfg
->afu
;
576 struct device
*dev
= &cfg
->dev
->dev
;
578 if (!afu
|| !cfg
->mcctx
) {
579 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
585 cxl_unmap_afu_irq(cfg
->mcctx
, 3, afu
);
587 cxl_unmap_afu_irq(cfg
->mcctx
, 2, afu
);
589 cxl_unmap_afu_irq(cfg
->mcctx
, 1, afu
);
591 cxl_free_afu_irqs(cfg
->mcctx
);
594 /* No action required */
600 * term_mc() - terminates the master context
601 * @cfg: Internal structure associated with the host.
602 * @level: Depth of allocation, where to begin waterfall tear down.
604 * Safe to call with AFU/MC in partially allocated/initialized state.
606 static void term_mc(struct cxlflash_cfg
*cfg
)
609 struct afu
*afu
= cfg
->afu
;
610 struct device
*dev
= &cfg
->dev
->dev
;
612 if (!afu
|| !cfg
->mcctx
) {
613 dev_err(dev
, "%s: returning with NULL afu or MC\n", __func__
);
617 rc
= cxl_stop_context(cfg
->mcctx
);
623 * term_afu() - terminates the AFU
624 * @cfg: Internal structure associated with the host.
626 * Safe to call with AFU/MC in partially allocated/initialized state.
628 static void term_afu(struct cxlflash_cfg
*cfg
)
630 struct device
*dev
= &cfg
->dev
->dev
;
633 * Tear down is carefully orchestrated to ensure
634 * no interrupts can come in when the problem state
637 * 1) Disable all AFU interrupts
638 * 2) Unmap the problem state area
639 * 3) Stop the master context
641 term_intr(cfg
, UNMAP_THREE
);
647 dev_dbg(dev
, "%s: returning\n", __func__
);
651 * notify_shutdown() - notifies device of pending shutdown
652 * @cfg: Internal structure associated with the host.
653 * @wait: Whether to wait for shutdown processing to complete.
655 * This function will notify the AFU that the adapter is being shutdown
656 * and will wait for shutdown processing to complete if wait is true.
657 * This notification should flush pending I/Os to the device and halt
658 * further I/Os until the next AFU reset is issued and device restarted.
660 static void notify_shutdown(struct cxlflash_cfg
*cfg
, bool wait
)
662 struct afu
*afu
= cfg
->afu
;
663 struct device
*dev
= &cfg
->dev
->dev
;
664 struct dev_dependent_vals
*ddv
;
665 __be64 __iomem
*fc_port_regs
;
667 int i
, retry_cnt
= 0;
669 ddv
= (struct dev_dependent_vals
*)cfg
->dev_id
->driver_data
;
670 if (!(ddv
->flags
& CXLFLASH_NOTIFY_SHUTDOWN
))
673 if (!afu
|| !afu
->afu_map
) {
674 dev_dbg(dev
, "%s: Problem state area not mapped\n", __func__
);
679 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
680 fc_port_regs
= get_fc_port_regs(cfg
, i
);
682 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
683 reg
|= SISL_FC_SHUTDOWN_NORMAL
;
684 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
690 /* Wait up to 1.5 seconds for shutdown processing to complete */
691 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
692 fc_port_regs
= get_fc_port_regs(cfg
, i
);
696 status
= readq_be(&fc_port_regs
[FC_STATUS
/ 8]);
697 if (status
& SISL_STATUS_SHUTDOWN_COMPLETE
)
699 if (++retry_cnt
>= MC_RETRY_CNT
) {
700 dev_dbg(dev
, "%s: port %d shutdown processing "
701 "not yet completed\n", __func__
, i
);
704 msleep(100 * retry_cnt
);
710 * cxlflash_remove() - PCI entry point to tear down host
711 * @pdev: PCI device associated with the host.
713 * Safe to use as a cleanup in partially allocated/initialized state. Note that
714 * the reset_waitq is flushed as part of the stop/termination of user contexts.
716 static void cxlflash_remove(struct pci_dev
*pdev
)
718 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
719 struct device
*dev
= &pdev
->dev
;
722 if (!pci_is_enabled(pdev
)) {
723 dev_dbg(dev
, "%s: Device is disabled\n", __func__
);
727 /* If a Task Management Function is active, wait for it to complete
728 * before continuing with remove.
730 spin_lock_irqsave(&cfg
->tmf_slock
, lock_flags
);
732 wait_event_interruptible_lock_irq(cfg
->tmf_waitq
,
735 spin_unlock_irqrestore(&cfg
->tmf_slock
, lock_flags
);
737 /* Notify AFU and wait for shutdown processing to complete */
738 notify_shutdown(cfg
, true);
740 cfg
->state
= STATE_FAILTERM
;
741 cxlflash_stop_term_user_contexts(cfg
);
743 switch (cfg
->init_state
) {
744 case INIT_STATE_SCSI
:
745 cxlflash_term_local_luns(cfg
);
746 scsi_remove_host(cfg
->host
);
750 pci_disable_device(pdev
);
751 case INIT_STATE_NONE
:
753 scsi_host_put(cfg
->host
);
757 dev_dbg(dev
, "%s: returning\n", __func__
);
761 * alloc_mem() - allocates the AFU and its command pool
762 * @cfg: Internal structure associated with the host.
764 * A partially allocated state remains on failure.
768 * -ENOMEM on failure to allocate memory
770 static int alloc_mem(struct cxlflash_cfg
*cfg
)
773 struct device
*dev
= &cfg
->dev
->dev
;
775 /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */
776 cfg
->afu
= (void *)__get_free_pages(GFP_KERNEL
| __GFP_ZERO
,
777 get_order(sizeof(struct afu
)));
778 if (unlikely(!cfg
->afu
)) {
779 dev_err(dev
, "%s: cannot get %d free pages\n",
780 __func__
, get_order(sizeof(struct afu
)));
784 cfg
->afu
->parent
= cfg
;
785 cfg
->afu
->afu_map
= NULL
;
791 * init_pci() - initializes the host as a PCI device
792 * @cfg: Internal structure associated with the host.
794 * Return: 0 on success, -errno on failure
796 static int init_pci(struct cxlflash_cfg
*cfg
)
798 struct pci_dev
*pdev
= cfg
->dev
;
799 struct device
*dev
= &cfg
->dev
->dev
;
802 rc
= pci_enable_device(pdev
);
803 if (rc
|| pci_channel_offline(pdev
)) {
804 if (pci_channel_offline(pdev
)) {
805 cxlflash_wait_for_pci_err_recovery(cfg
);
806 rc
= pci_enable_device(pdev
);
810 dev_err(dev
, "%s: Cannot enable adapter\n", __func__
);
811 cxlflash_wait_for_pci_err_recovery(cfg
);
817 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
822 * init_scsi() - adds the host to the SCSI stack and kicks off host scan
823 * @cfg: Internal structure associated with the host.
825 * Return: 0 on success, -errno on failure
827 static int init_scsi(struct cxlflash_cfg
*cfg
)
829 struct pci_dev
*pdev
= cfg
->dev
;
830 struct device
*dev
= &cfg
->dev
->dev
;
833 rc
= scsi_add_host(cfg
->host
, &pdev
->dev
);
835 dev_err(dev
, "%s: scsi_add_host failed rc=%d\n", __func__
, rc
);
839 scsi_scan_host(cfg
->host
);
842 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
847 * set_port_online() - transitions the specified host FC port to online state
848 * @fc_regs: Top of MMIO region defined for specified port.
850 * The provided MMIO region must be mapped prior to call. Online state means
851 * that the FC link layer has synced, completed the handshaking process, and
852 * is ready for login to start.
854 static void set_port_online(__be64 __iomem
*fc_regs
)
858 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
859 cmdcfg
&= (~FC_MTIP_CMDCONFIG_OFFLINE
); /* clear OFF_LINE */
860 cmdcfg
|= (FC_MTIP_CMDCONFIG_ONLINE
); /* set ON_LINE */
861 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
865 * set_port_offline() - transitions the specified host FC port to offline state
866 * @fc_regs: Top of MMIO region defined for specified port.
868 * The provided MMIO region must be mapped prior to call.
870 static void set_port_offline(__be64 __iomem
*fc_regs
)
874 cmdcfg
= readq_be(&fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
875 cmdcfg
&= (~FC_MTIP_CMDCONFIG_ONLINE
); /* clear ON_LINE */
876 cmdcfg
|= (FC_MTIP_CMDCONFIG_OFFLINE
); /* set OFF_LINE */
877 writeq_be(cmdcfg
, &fc_regs
[FC_MTIP_CMDCONFIG
/ 8]);
881 * wait_port_online() - waits for the specified host FC port come online
882 * @fc_regs: Top of MMIO region defined for specified port.
883 * @delay_us: Number of microseconds to delay between reading port status.
884 * @nretry: Number of cycles to retry reading port status.
886 * The provided MMIO region must be mapped prior to call. This will timeout
887 * when the cable is not plugged in.
890 * TRUE (1) when the specified port is online
891 * FALSE (0) when the specified port fails to come online after timeout
893 static bool wait_port_online(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
897 WARN_ON(delay_us
< 1000);
900 msleep(delay_us
/ 1000);
901 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
902 if (status
== U64_MAX
)
904 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_ONLINE
&&
907 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_ONLINE
);
911 * wait_port_offline() - waits for the specified host FC port go offline
912 * @fc_regs: Top of MMIO region defined for specified port.
913 * @delay_us: Number of microseconds to delay between reading port status.
914 * @nretry: Number of cycles to retry reading port status.
916 * The provided MMIO region must be mapped prior to call.
919 * TRUE (1) when the specified port is offline
920 * FALSE (0) when the specified port fails to go offline after timeout
922 static bool wait_port_offline(__be64 __iomem
*fc_regs
, u32 delay_us
, u32 nretry
)
926 WARN_ON(delay_us
< 1000);
929 msleep(delay_us
/ 1000);
930 status
= readq_be(&fc_regs
[FC_MTIP_STATUS
/ 8]);
931 if (status
== U64_MAX
)
933 } while ((status
& FC_MTIP_STATUS_MASK
) != FC_MTIP_STATUS_OFFLINE
&&
936 return ((status
& FC_MTIP_STATUS_MASK
) == FC_MTIP_STATUS_OFFLINE
);
940 * afu_set_wwpn() - configures the WWPN for the specified host FC port
941 * @afu: AFU associated with the host that owns the specified FC port.
942 * @port: Port number being configured.
943 * @fc_regs: Top of MMIO region defined for specified port.
944 * @wwpn: The world-wide-port-number previously discovered for port.
946 * The provided MMIO region must be mapped prior to call. As part of the
947 * sequence to configure the WWPN, the port is toggled offline and then back
948 * online. This toggling action can cause this routine to delay up to a few
949 * seconds. When configured to use the internal LUN feature of the AFU, a
950 * failure to come online is overridden.
952 static void afu_set_wwpn(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
,
955 struct cxlflash_cfg
*cfg
= afu
->parent
;
956 struct device
*dev
= &cfg
->dev
->dev
;
958 set_port_offline(fc_regs
);
959 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
960 FC_PORT_STATUS_RETRY_CNT
)) {
961 dev_dbg(dev
, "%s: wait on port %d to go offline timed out\n",
965 writeq_be(wwpn
, &fc_regs
[FC_PNAME
/ 8]);
967 set_port_online(fc_regs
);
968 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
969 FC_PORT_STATUS_RETRY_CNT
)) {
970 dev_dbg(dev
, "%s: wait on port %d to go online timed out\n",
976 * afu_link_reset() - resets the specified host FC port
977 * @afu: AFU associated with the host that owns the specified FC port.
978 * @port: Port number being configured.
979 * @fc_regs: Top of MMIO region defined for specified port.
981 * The provided MMIO region must be mapped prior to call. The sequence to
982 * reset the port involves toggling it offline and then back online. This
983 * action can cause this routine to delay up to a few seconds. An effort
984 * is made to maintain link with the device by switching to host to use
985 * the alternate port exclusively while the reset takes place.
986 * failure to come online is overridden.
988 static void afu_link_reset(struct afu
*afu
, int port
, __be64 __iomem
*fc_regs
)
990 struct cxlflash_cfg
*cfg
= afu
->parent
;
991 struct device
*dev
= &cfg
->dev
->dev
;
994 /* first switch the AFU to the other links, if any */
995 port_sel
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
996 port_sel
&= ~(1ULL << port
);
997 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
998 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1000 set_port_offline(fc_regs
);
1001 if (!wait_port_offline(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1002 FC_PORT_STATUS_RETRY_CNT
))
1003 dev_err(dev
, "%s: wait on port %d to go offline timed out\n",
1006 set_port_online(fc_regs
);
1007 if (!wait_port_online(fc_regs
, FC_PORT_STATUS_RETRY_INTERVAL_US
,
1008 FC_PORT_STATUS_RETRY_CNT
))
1009 dev_err(dev
, "%s: wait on port %d to go online timed out\n",
1012 /* switch back to include this port */
1013 port_sel
|= (1ULL << port
);
1014 writeq_be(port_sel
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1015 cxlflash_afu_sync(afu
, 0, 0, AFU_GSYNC
);
1017 dev_dbg(dev
, "%s: returning port_sel=%016llx\n", __func__
, port_sel
);
1021 * Asynchronous interrupt information table
1023 * NOTE: The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro
1024 * as complex and complains because it is not wrapped with parentheses/braces.
1026 #define ASTATUS_FC(_a, _b, _c, _d) \
1027 { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) }
1029 #define BUILD_SISL_ASTATUS_FC_PORT(_a) \
1030 ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET), \
1031 ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \
1032 ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \
1033 ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \
1034 ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \
1035 ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \
1036 ASTATUS_FC(_a, LINK_DN, "link down", 0), \
1037 ASTATUS_FC(_a, LINK_UP, "link up", 0)
1039 static const struct asyc_intr_info ainfo
[] = {
1040 BUILD_SISL_ASTATUS_FC_PORT(2),
1041 BUILD_SISL_ASTATUS_FC_PORT(3),
1042 BUILD_SISL_ASTATUS_FC_PORT(0),
1043 BUILD_SISL_ASTATUS_FC_PORT(1),
1048 * find_ainfo() - locates and returns asynchronous interrupt information
1049 * @status: Status code set by AFU on error.
1051 * Return: The located information or NULL when the status code is invalid.
1053 static const struct asyc_intr_info
*find_ainfo(u64 status
)
1055 const struct asyc_intr_info
*info
;
1057 BUILD_BUG_ON(ainfo
[ARRAY_SIZE(ainfo
) - 1].status
!= 0);
1059 for (info
= &ainfo
[0]; info
->status
; info
++)
1060 if (info
->status
== status
)
1067 * afu_err_intr_init() - clears and initializes the AFU for error interrupts
1068 * @afu: AFU associated with the host.
1070 static void afu_err_intr_init(struct afu
*afu
)
1072 struct cxlflash_cfg
*cfg
= afu
->parent
;
1073 __be64 __iomem
*fc_port_regs
;
1077 /* global async interrupts: AFU clears afu_ctrl on context exit
1078 * if async interrupts were sent to that context. This prevents
1079 * the AFU form sending further async interrupts when
1081 * nobody to receive them.
1085 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_mask
);
1086 /* set LISN# to send and point to master context */
1087 reg
= ((u64
) (((afu
->ctx_hndl
<< 8) | SISL_MSI_ASYNC_ERROR
)) << 40);
1089 if (afu
->internal_lun
)
1090 reg
|= 1; /* Bit 63 indicates local lun */
1091 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_ctrl
);
1093 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1094 /* unmask bits that are of interest */
1095 /* note: afu can send an interrupt after this step */
1096 writeq_be(SISL_ASTATUS_MASK
, &afu
->afu_map
->global
.regs
.aintr_mask
);
1097 /* clear again in case a bit came on after previous clear but before */
1099 writeq_be(-1ULL, &afu
->afu_map
->global
.regs
.aintr_clear
);
1101 /* Clear/Set internal lun bits */
1102 fc_port_regs
= get_fc_port_regs(cfg
, 0);
1103 reg
= readq_be(&fc_port_regs
[FC_CONFIG2
/ 8]);
1104 reg
&= SISL_FC_INTERNAL_MASK
;
1105 if (afu
->internal_lun
)
1106 reg
|= ((u64
)(afu
->internal_lun
- 1) << SISL_FC_INTERNAL_SHIFT
);
1107 writeq_be(reg
, &fc_port_regs
[FC_CONFIG2
/ 8]);
1109 /* now clear FC errors */
1110 for (i
= 0; i
< cfg
->num_fc_ports
; i
++) {
1111 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1113 writeq_be(0xFFFFFFFFU
, &fc_port_regs
[FC_ERROR
/ 8]);
1114 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1117 /* sync interrupts for master's IOARRIN write */
1118 /* note that unlike asyncs, there can be no pending sync interrupts */
1119 /* at this time (this is a fresh context and master has not written */
1120 /* IOARRIN yet), so there is nothing to clear. */
1122 /* set LISN#, it is always sent to the context that wrote IOARRIN */
1123 writeq_be(SISL_MSI_SYNC_ERROR
, &afu
->host_map
->ctx_ctrl
);
1124 writeq_be(SISL_ISTATUS_MASK
, &afu
->host_map
->intr_mask
);
1128 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors
1129 * @irq: Interrupt number.
1130 * @data: Private data provided at interrupt registration, the AFU.
1132 * Return: Always return IRQ_HANDLED.
1134 static irqreturn_t
cxlflash_sync_err_irq(int irq
, void *data
)
1136 struct afu
*afu
= (struct afu
*)data
;
1137 struct cxlflash_cfg
*cfg
= afu
->parent
;
1138 struct device
*dev
= &cfg
->dev
->dev
;
1142 reg
= readq_be(&afu
->host_map
->intr_status
);
1143 reg_unmasked
= (reg
& SISL_ISTATUS_UNMASK
);
1145 if (reg_unmasked
== 0UL) {
1146 dev_err(dev
, "%s: spurious interrupt, intr_status=%016llx\n",
1148 goto cxlflash_sync_err_irq_exit
;
1151 dev_err(dev
, "%s: unexpected interrupt, intr_status=%016llx\n",
1154 writeq_be(reg_unmasked
, &afu
->host_map
->intr_clear
);
1156 cxlflash_sync_err_irq_exit
:
1161 * process_hrrq() - process the read-response queue
1162 * @afu: AFU associated with the host.
1163 * @doneq: Queue of commands harvested from the RRQ.
1164 * @budget: Threshold of RRQ entries to process.
1166 * This routine must be called holding the disabled RRQ spin lock.
1168 * Return: The number of entries processed.
1170 static int process_hrrq(struct afu
*afu
, struct list_head
*doneq
, int budget
)
1172 struct afu_cmd
*cmd
;
1173 struct sisl_ioasa
*ioasa
;
1174 struct sisl_ioarcb
*ioarcb
;
1175 bool toggle
= afu
->toggle
;
1178 *hrrq_start
= afu
->hrrq_start
,
1179 *hrrq_end
= afu
->hrrq_end
,
1180 *hrrq_curr
= afu
->hrrq_curr
;
1182 /* Process ready RRQ entries up to the specified budget (if any) */
1186 if ((entry
& SISL_RESP_HANDLE_T_BIT
) != toggle
)
1189 entry
&= ~SISL_RESP_HANDLE_T_BIT
;
1191 if (afu_is_sq_cmd_mode(afu
)) {
1192 ioasa
= (struct sisl_ioasa
*)entry
;
1193 cmd
= container_of(ioasa
, struct afu_cmd
, sa
);
1195 ioarcb
= (struct sisl_ioarcb
*)entry
;
1196 cmd
= container_of(ioarcb
, struct afu_cmd
, rcb
);
1199 list_add_tail(&cmd
->queue
, doneq
);
1201 /* Advance to next entry or wrap and flip the toggle bit */
1202 if (hrrq_curr
< hrrq_end
)
1205 hrrq_curr
= hrrq_start
;
1206 toggle
^= SISL_RESP_HANDLE_T_BIT
;
1209 atomic_inc(&afu
->hsq_credits
);
1212 if (budget
> 0 && num_hrrq
>= budget
)
1216 afu
->hrrq_curr
= hrrq_curr
;
1217 afu
->toggle
= toggle
;
1223 * process_cmd_doneq() - process a queue of harvested RRQ commands
1224 * @doneq: Queue of completed commands.
1226 * Note that upon return the queue can no longer be trusted.
1228 static void process_cmd_doneq(struct list_head
*doneq
)
1230 struct afu_cmd
*cmd
, *tmp
;
1232 WARN_ON(list_empty(doneq
));
1234 list_for_each_entry_safe(cmd
, tmp
, doneq
, queue
)
1239 * cxlflash_irqpoll() - process a queue of harvested RRQ commands
1240 * @irqpoll: IRQ poll structure associated with queue to poll.
1241 * @budget: Threshold of RRQ entries to process per poll.
1243 * Return: The number of entries processed.
1245 static int cxlflash_irqpoll(struct irq_poll
*irqpoll
, int budget
)
1247 struct afu
*afu
= container_of(irqpoll
, struct afu
, irqpoll
);
1248 unsigned long hrrq_flags
;
1250 int num_entries
= 0;
1252 spin_lock_irqsave(&afu
->hrrq_slock
, hrrq_flags
);
1254 num_entries
= process_hrrq(afu
, &doneq
, budget
);
1255 if (num_entries
< budget
)
1256 irq_poll_complete(irqpoll
);
1258 spin_unlock_irqrestore(&afu
->hrrq_slock
, hrrq_flags
);
1260 process_cmd_doneq(&doneq
);
1265 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path)
1266 * @irq: Interrupt number.
1267 * @data: Private data provided at interrupt registration, the AFU.
1269 * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found.
1271 static irqreturn_t
cxlflash_rrq_irq(int irq
, void *data
)
1273 struct afu
*afu
= (struct afu
*)data
;
1274 unsigned long hrrq_flags
;
1276 int num_entries
= 0;
1278 spin_lock_irqsave(&afu
->hrrq_slock
, hrrq_flags
);
1280 if (afu_is_irqpoll_enabled(afu
)) {
1281 irq_poll_sched(&afu
->irqpoll
);
1282 spin_unlock_irqrestore(&afu
->hrrq_slock
, hrrq_flags
);
1286 num_entries
= process_hrrq(afu
, &doneq
, -1);
1287 spin_unlock_irqrestore(&afu
->hrrq_slock
, hrrq_flags
);
1289 if (num_entries
== 0)
1292 process_cmd_doneq(&doneq
);
1297 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors
1298 * @irq: Interrupt number.
1299 * @data: Private data provided at interrupt registration, the AFU.
1301 * Return: Always return IRQ_HANDLED.
1303 static irqreturn_t
cxlflash_async_err_irq(int irq
, void *data
)
1305 struct afu
*afu
= (struct afu
*)data
;
1306 struct cxlflash_cfg
*cfg
= afu
->parent
;
1307 struct device
*dev
= &cfg
->dev
->dev
;
1309 const struct asyc_intr_info
*info
;
1310 struct sisl_global_map __iomem
*global
= &afu
->afu_map
->global
;
1311 __be64 __iomem
*fc_port_regs
;
1316 reg
= readq_be(&global
->regs
.aintr_status
);
1317 reg_unmasked
= (reg
& SISL_ASTATUS_UNMASK
);
1319 if (reg_unmasked
== 0) {
1320 dev_err(dev
, "%s: spurious interrupt, aintr_status=%016llx\n",
1325 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */
1326 writeq_be(reg_unmasked
, &global
->regs
.aintr_clear
);
1328 /* Check each bit that is on */
1329 for (i
= 0; reg_unmasked
; i
++, reg_unmasked
= (reg_unmasked
>> 1)) {
1330 info
= find_ainfo(1ULL << i
);
1331 if (((reg_unmasked
& 0x1) == 0) || !info
)
1335 fc_port_regs
= get_fc_port_regs(cfg
, port
);
1337 dev_err(dev
, "%s: FC Port %d -> %s, fc_status=%016llx\n",
1338 __func__
, port
, info
->desc
,
1339 readq_be(&fc_port_regs
[FC_STATUS
/ 8]));
1342 * Do link reset first, some OTHER errors will set FC_ERROR
1343 * again if cleared before or w/o a reset
1345 if (info
->action
& LINK_RESET
) {
1346 dev_err(dev
, "%s: FC Port %d: resetting link\n",
1348 cfg
->lr_state
= LINK_RESET_REQUIRED
;
1349 cfg
->lr_port
= port
;
1350 schedule_work(&cfg
->work_q
);
1353 if (info
->action
& CLR_FC_ERROR
) {
1354 reg
= readq_be(&fc_port_regs
[FC_ERROR
/ 8]);
1357 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP
1358 * should be the same and tracing one is sufficient.
1361 dev_err(dev
, "%s: fc %d: clearing fc_error=%016llx\n",
1362 __func__
, port
, reg
);
1364 writeq_be(reg
, &fc_port_regs
[FC_ERROR
/ 8]);
1365 writeq_be(0, &fc_port_regs
[FC_ERRCAP
/ 8]);
1368 if (info
->action
& SCAN_HOST
) {
1369 atomic_inc(&cfg
->scan_host_needed
);
1370 schedule_work(&cfg
->work_q
);
1379 * start_context() - starts the master context
1380 * @cfg: Internal structure associated with the host.
1382 * Return: A success or failure value from CXL services.
1384 static int start_context(struct cxlflash_cfg
*cfg
)
1386 struct device
*dev
= &cfg
->dev
->dev
;
1389 rc
= cxl_start_context(cfg
->mcctx
,
1390 cfg
->afu
->work
.work_element_descriptor
,
1393 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1398 * read_vpd() - obtains the WWPNs from VPD
1399 * @cfg: Internal structure associated with the host.
1400 * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs
1402 * Return: 0 on success, -errno on failure
1404 static int read_vpd(struct cxlflash_cfg
*cfg
, u64 wwpn
[])
1406 struct device
*dev
= &cfg
->dev
->dev
;
1407 struct pci_dev
*pdev
= cfg
->dev
;
1409 int ro_start
, ro_size
, i
, j
, k
;
1411 char vpd_data
[CXLFLASH_VPD_LEN
];
1412 char tmp_buf
[WWPN_BUF_LEN
] = { 0 };
1413 char *wwpn_vpd_tags
[MAX_FC_PORTS
] = { "V5", "V6", "V7", "V8" };
1415 /* Get the VPD data from the device */
1416 vpd_size
= cxl_read_adapter_vpd(pdev
, vpd_data
, sizeof(vpd_data
));
1417 if (unlikely(vpd_size
<= 0)) {
1418 dev_err(dev
, "%s: Unable to read VPD (size = %ld)\n",
1419 __func__
, vpd_size
);
1424 /* Get the read only section offset */
1425 ro_start
= pci_vpd_find_tag(vpd_data
, 0, vpd_size
,
1426 PCI_VPD_LRDT_RO_DATA
);
1427 if (unlikely(ro_start
< 0)) {
1428 dev_err(dev
, "%s: VPD Read-only data not found\n", __func__
);
1433 /* Get the read only section size, cap when extends beyond read VPD */
1434 ro_size
= pci_vpd_lrdt_size(&vpd_data
[ro_start
]);
1436 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1437 if (unlikely((i
+ j
) > vpd_size
)) {
1438 dev_dbg(dev
, "%s: Might need to read more VPD (%d > %ld)\n",
1439 __func__
, (i
+ j
), vpd_size
);
1440 ro_size
= vpd_size
- i
;
1444 * Find the offset of the WWPN tag within the read only
1445 * VPD data and validate the found field (partials are
1446 * no good to us). Convert the ASCII data to an integer
1447 * value. Note that we must copy to a temporary buffer
1448 * because the conversion service requires that the ASCII
1449 * string be terminated.
1451 for (k
= 0; k
< cfg
->num_fc_ports
; k
++) {
1453 i
= ro_start
+ PCI_VPD_LRDT_TAG_SIZE
;
1455 i
= pci_vpd_find_info_keyword(vpd_data
, i
, j
, wwpn_vpd_tags
[k
]);
1456 if (unlikely(i
< 0)) {
1457 dev_err(dev
, "%s: Port %d WWPN not found in VPD\n",
1463 j
= pci_vpd_info_field_size(&vpd_data
[i
]);
1464 i
+= PCI_VPD_INFO_FLD_HDR_SIZE
;
1465 if (unlikely((i
+ j
> vpd_size
) || (j
!= WWPN_LEN
))) {
1466 dev_err(dev
, "%s: Port %d WWPN incomplete or bad VPD\n",
1472 memcpy(tmp_buf
, &vpd_data
[i
], WWPN_LEN
);
1473 rc
= kstrtoul(tmp_buf
, WWPN_LEN
, (ulong
*)&wwpn
[k
]);
1475 dev_err(dev
, "%s: WWPN conversion failed for port %d\n",
1481 dev_dbg(dev
, "%s: wwpn%d=%016llx\n", __func__
, k
, wwpn
[k
]);
1485 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1490 * init_pcr() - initialize the provisioning and control registers
1491 * @cfg: Internal structure associated with the host.
1493 * Also sets up fast access to the mapped registers and initializes AFU
1494 * command fields that never change.
1496 static void init_pcr(struct cxlflash_cfg
*cfg
)
1498 struct afu
*afu
= cfg
->afu
;
1499 struct sisl_ctrl_map __iomem
*ctrl_map
;
1502 for (i
= 0; i
< MAX_CONTEXT
; i
++) {
1503 ctrl_map
= &afu
->afu_map
->ctrls
[i
].ctrl
;
1504 /* Disrupt any clients that could be running */
1505 /* e.g. clients that survived a master restart */
1506 writeq_be(0, &ctrl_map
->rht_start
);
1507 writeq_be(0, &ctrl_map
->rht_cnt_id
);
1508 writeq_be(0, &ctrl_map
->ctx_cap
);
1511 /* Copy frequently used fields into afu */
1512 afu
->ctx_hndl
= (u16
) cxl_process_element(cfg
->mcctx
);
1513 afu
->host_map
= &afu
->afu_map
->hosts
[afu
->ctx_hndl
].host
;
1514 afu
->ctrl_map
= &afu
->afu_map
->ctrls
[afu
->ctx_hndl
].ctrl
;
1516 /* Program the Endian Control for the master context */
1517 writeq_be(SISL_ENDIAN_CTRL
, &afu
->host_map
->endian_ctrl
);
1521 * init_global() - initialize AFU global registers
1522 * @cfg: Internal structure associated with the host.
1524 static int init_global(struct cxlflash_cfg
*cfg
)
1526 struct afu
*afu
= cfg
->afu
;
1527 struct device
*dev
= &cfg
->dev
->dev
;
1528 __be64 __iomem
*fc_port_regs
;
1529 u64 wwpn
[MAX_FC_PORTS
]; /* wwpn of AFU ports */
1530 int i
= 0, num_ports
= 0;
1534 rc
= read_vpd(cfg
, &wwpn
[0]);
1536 dev_err(dev
, "%s: could not read vpd rc=%d\n", __func__
, rc
);
1540 /* Set up RRQ and SQ in AFU for master issued cmds */
1541 writeq_be((u64
) afu
->hrrq_start
, &afu
->host_map
->rrq_start
);
1542 writeq_be((u64
) afu
->hrrq_end
, &afu
->host_map
->rrq_end
);
1544 if (afu_is_sq_cmd_mode(afu
)) {
1545 writeq_be((u64
)afu
->hsq_start
, &afu
->host_map
->sq_start
);
1546 writeq_be((u64
)afu
->hsq_end
, &afu
->host_map
->sq_end
);
1549 /* AFU configuration */
1550 reg
= readq_be(&afu
->afu_map
->global
.regs
.afu_config
);
1551 reg
|= SISL_AFUCONF_AR_ALL
|SISL_AFUCONF_ENDIAN
;
1552 /* enable all auto retry options and control endianness */
1553 /* leave others at default: */
1554 /* CTX_CAP write protected, mbox_r does not clear on read and */
1555 /* checker on if dual afu */
1556 writeq_be(reg
, &afu
->afu_map
->global
.regs
.afu_config
);
1558 /* Global port select: select either port */
1559 if (afu
->internal_lun
) {
1560 /* Only use port 0 */
1561 writeq_be(PORT0
, &afu
->afu_map
->global
.regs
.afu_port_sel
);
1564 writeq_be(PORT_MASK(cfg
->num_fc_ports
),
1565 &afu
->afu_map
->global
.regs
.afu_port_sel
);
1566 num_ports
= cfg
->num_fc_ports
;
1569 for (i
= 0; i
< num_ports
; i
++) {
1570 fc_port_regs
= get_fc_port_regs(cfg
, i
);
1572 /* Unmask all errors (but they are still masked at AFU) */
1573 writeq_be(0, &fc_port_regs
[FC_ERRMSK
/ 8]);
1574 /* Clear CRC error cnt & set a threshold */
1575 (void)readq_be(&fc_port_regs
[FC_CNT_CRCERR
/ 8]);
1576 writeq_be(MC_CRC_THRESH
, &fc_port_regs
[FC_CRC_THRESH
/ 8]);
1578 /* Set WWPNs. If already programmed, wwpn[i] is 0 */
1580 afu_set_wwpn(afu
, i
, &fc_port_regs
[0], wwpn
[i
]);
1581 /* Programming WWPN back to back causes additional
1582 * offline/online transitions and a PLOGI
1587 /* Set up master's own CTX_CAP to allow real mode, host translation */
1588 /* tables, afu cmds and read/write GSCSI cmds. */
1589 /* First, unlock ctx_cap write by reading mbox */
1590 (void)readq_be(&afu
->ctrl_map
->mbox_r
); /* unlock ctx_cap */
1591 writeq_be((SISL_CTX_CAP_REAL_MODE
| SISL_CTX_CAP_HOST_XLATE
|
1592 SISL_CTX_CAP_READ_CMD
| SISL_CTX_CAP_WRITE_CMD
|
1593 SISL_CTX_CAP_AFU_CMD
| SISL_CTX_CAP_GSCSI_CMD
),
1594 &afu
->ctrl_map
->ctx_cap
);
1595 /* Initialize heartbeat */
1596 afu
->hb
= readq_be(&afu
->afu_map
->global
.regs
.afu_hb
);
1602 * start_afu() - initializes and starts the AFU
1603 * @cfg: Internal structure associated with the host.
1605 static int start_afu(struct cxlflash_cfg
*cfg
)
1607 struct afu
*afu
= cfg
->afu
;
1608 struct device
*dev
= &cfg
->dev
->dev
;
1613 /* Initialize RRQ */
1614 memset(&afu
->rrq_entry
, 0, sizeof(afu
->rrq_entry
));
1615 afu
->hrrq_start
= &afu
->rrq_entry
[0];
1616 afu
->hrrq_end
= &afu
->rrq_entry
[NUM_RRQ_ENTRY
- 1];
1617 afu
->hrrq_curr
= afu
->hrrq_start
;
1619 spin_lock_init(&afu
->hrrq_slock
);
1622 if (afu_is_sq_cmd_mode(afu
)) {
1623 memset(&afu
->sq
, 0, sizeof(afu
->sq
));
1624 afu
->hsq_start
= &afu
->sq
[0];
1625 afu
->hsq_end
= &afu
->sq
[NUM_SQ_ENTRY
- 1];
1626 afu
->hsq_curr
= afu
->hsq_start
;
1628 spin_lock_init(&afu
->hsq_slock
);
1629 atomic_set(&afu
->hsq_credits
, NUM_SQ_ENTRY
- 1);
1632 /* Initialize IRQ poll */
1633 if (afu_is_irqpoll_enabled(afu
))
1634 irq_poll_init(&afu
->irqpoll
, afu
->irqpoll_weight
,
1637 rc
= init_global(cfg
);
1639 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1644 * init_intr() - setup interrupt handlers for the master context
1645 * @cfg: Internal structure associated with the host.
1647 * Return: 0 on success, -errno on failure
1649 static enum undo_level
init_intr(struct cxlflash_cfg
*cfg
,
1650 struct cxl_context
*ctx
)
1652 struct afu
*afu
= cfg
->afu
;
1653 struct device
*dev
= &cfg
->dev
->dev
;
1655 enum undo_level level
= UNDO_NOOP
;
1657 rc
= cxl_allocate_afu_irqs(ctx
, 3);
1659 dev_err(dev
, "%s: allocate_afu_irqs failed rc=%d\n",
1665 rc
= cxl_map_afu_irq(ctx
, 1, cxlflash_sync_err_irq
, afu
,
1666 "SISL_MSI_SYNC_ERROR");
1667 if (unlikely(rc
<= 0)) {
1668 dev_err(dev
, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__
);
1673 rc
= cxl_map_afu_irq(ctx
, 2, cxlflash_rrq_irq
, afu
,
1674 "SISL_MSI_RRQ_UPDATED");
1675 if (unlikely(rc
<= 0)) {
1676 dev_err(dev
, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__
);
1681 rc
= cxl_map_afu_irq(ctx
, 3, cxlflash_async_err_irq
, afu
,
1682 "SISL_MSI_ASYNC_ERROR");
1683 if (unlikely(rc
<= 0)) {
1684 dev_err(dev
, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__
);
1693 * init_mc() - create and register as the master context
1694 * @cfg: Internal structure associated with the host.
1696 * Return: 0 on success, -errno on failure
1698 static int init_mc(struct cxlflash_cfg
*cfg
)
1700 struct cxl_context
*ctx
;
1701 struct device
*dev
= &cfg
->dev
->dev
;
1703 enum undo_level level
;
1705 ctx
= cxl_get_context(cfg
->dev
);
1706 if (unlikely(!ctx
)) {
1712 /* Set it up as a master with the CXL */
1713 cxl_set_master(ctx
);
1715 /* During initialization reset the AFU to start from a clean slate */
1716 rc
= cxl_afu_reset(cfg
->mcctx
);
1718 dev_err(dev
, "%s: AFU reset failed rc=%d\n", __func__
, rc
);
1722 level
= init_intr(cfg
, ctx
);
1723 if (unlikely(level
)) {
1724 dev_err(dev
, "%s: interrupt init failed rc=%d\n", __func__
, rc
);
1728 /* This performs the equivalent of the CXL_IOCTL_START_WORK.
1729 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
1730 * element (pe) that is embedded in the context (ctx)
1732 rc
= start_context(cfg
);
1734 dev_err(dev
, "%s: start context failed rc=%d\n", __func__
, rc
);
1735 level
= UNMAP_THREE
;
1739 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1742 term_intr(cfg
, level
);
1747 * get_num_afu_ports() - determines and configures the number of AFU ports
1748 * @cfg: Internal structure associated with the host.
1750 * This routine determines the number of AFU ports by converting the global
1751 * port selection mask. The converted value is only valid following an AFU
1752 * reset (explicit or power-on). This routine must be invoked shortly after
1753 * mapping as other routines are dependent on the number of ports during the
1754 * initialization sequence.
1756 * To support legacy AFUs that might not have reflected an initial global
1757 * port mask (value read is 0), default to the number of ports originally
1758 * supported by the cxlflash driver (2) before hardware with other port
1759 * offerings was introduced.
1761 static void get_num_afu_ports(struct cxlflash_cfg
*cfg
)
1763 struct afu
*afu
= cfg
->afu
;
1764 struct device
*dev
= &cfg
->dev
->dev
;
1766 int num_fc_ports
= LEGACY_FC_PORTS
;
1768 port_mask
= readq_be(&afu
->afu_map
->global
.regs
.afu_port_sel
);
1769 if (port_mask
!= 0ULL)
1770 num_fc_ports
= min(ilog2(port_mask
) + 1, MAX_FC_PORTS
);
1772 dev_dbg(dev
, "%s: port_mask=%016llx num_fc_ports=%d\n",
1773 __func__
, port_mask
, num_fc_ports
);
1775 cfg
->num_fc_ports
= num_fc_ports
;
1776 cfg
->host
->max_channel
= PORTNUM2CHAN(num_fc_ports
);
1780 * init_afu() - setup as master context and start AFU
1781 * @cfg: Internal structure associated with the host.
1783 * This routine is a higher level of control for configuring the
1784 * AFU on probe and reset paths.
1786 * Return: 0 on success, -errno on failure
1788 static int init_afu(struct cxlflash_cfg
*cfg
)
1792 struct afu
*afu
= cfg
->afu
;
1793 struct device
*dev
= &cfg
->dev
->dev
;
1795 cxl_perst_reloads_same_image(cfg
->cxl_afu
, true);
1799 dev_err(dev
, "%s: init_mc failed rc=%d\n",
1804 /* Map the entire MMIO space of the AFU */
1805 afu
->afu_map
= cxl_psa_map(cfg
->mcctx
);
1806 if (!afu
->afu_map
) {
1807 dev_err(dev
, "%s: cxl_psa_map failed\n", __func__
);
1812 /* No byte reverse on reading afu_version or string will be backwards */
1813 reg
= readq(&afu
->afu_map
->global
.regs
.afu_version
);
1814 memcpy(afu
->version
, ®
, sizeof(reg
));
1815 afu
->interface_version
=
1816 readq_be(&afu
->afu_map
->global
.regs
.interface_version
);
1817 if ((afu
->interface_version
+ 1) == 0) {
1818 dev_err(dev
, "Back level AFU, please upgrade. AFU version %s "
1819 "interface version %016llx\n", afu
->version
,
1820 afu
->interface_version
);
1825 if (afu_is_sq_cmd_mode(afu
)) {
1826 afu
->send_cmd
= send_cmd_sq
;
1827 afu
->context_reset
= context_reset_sq
;
1829 afu
->send_cmd
= send_cmd_ioarrin
;
1830 afu
->context_reset
= context_reset_ioarrin
;
1833 dev_dbg(dev
, "%s: afu_ver=%s interface_ver=%016llx\n", __func__
,
1834 afu
->version
, afu
->interface_version
);
1836 get_num_afu_ports(cfg
);
1838 rc
= start_afu(cfg
);
1840 dev_err(dev
, "%s: start_afu failed, rc=%d\n", __func__
, rc
);
1844 afu_err_intr_init(cfg
->afu
);
1845 spin_lock_init(&afu
->rrin_slock
);
1846 afu
->room
= readq_be(&afu
->host_map
->cmd_room
);
1848 /* Restore the LUN mappings */
1849 cxlflash_restore_luntable(cfg
);
1851 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1855 term_intr(cfg
, UNMAP_THREE
);
1861 * cxlflash_afu_sync() - builds and sends an AFU sync command
1862 * @afu: AFU associated with the host.
1863 * @ctx_hndl_u: Identifies context requesting sync.
1864 * @res_hndl_u: Identifies resource requesting sync.
1865 * @mode: Type of sync to issue (lightweight, heavyweight, global).
1867 * The AFU can only take 1 sync command at a time. This routine enforces this
1868 * limitation by using a mutex to provide exclusive access to the AFU during
1869 * the sync. This design point requires calling threads to not be on interrupt
1870 * context due to the possibility of sleeping during concurrent sync operations.
1872 * AFU sync operations are only necessary and allowed when the device is
1873 * operating normally. When not operating normally, sync requests can occur as
1874 * part of cleaning up resources associated with an adapter prior to removal.
1875 * In this scenario, these requests are simply ignored (safe due to the AFU
1882 int cxlflash_afu_sync(struct afu
*afu
, ctx_hndl_t ctx_hndl_u
,
1883 res_hndl_t res_hndl_u
, u8 mode
)
1885 struct cxlflash_cfg
*cfg
= afu
->parent
;
1886 struct device
*dev
= &cfg
->dev
->dev
;
1887 struct afu_cmd
*cmd
= NULL
;
1890 static DEFINE_MUTEX(sync_active
);
1892 if (cfg
->state
!= STATE_NORMAL
) {
1893 dev_dbg(dev
, "%s: Sync not required state=%u\n",
1894 __func__
, cfg
->state
);
1898 mutex_lock(&sync_active
);
1899 atomic_inc(&afu
->cmds_active
);
1900 buf
= kzalloc(sizeof(*cmd
) + __alignof__(*cmd
) - 1, GFP_KERNEL
);
1901 if (unlikely(!buf
)) {
1902 dev_err(dev
, "%s: no memory for command\n", __func__
);
1907 cmd
= (struct afu_cmd
*)PTR_ALIGN(buf
, __alignof__(*cmd
));
1908 init_completion(&cmd
->cevent
);
1911 dev_dbg(dev
, "%s: afu=%p cmd=%p %d\n", __func__
, afu
, cmd
, ctx_hndl_u
);
1913 cmd
->rcb
.req_flags
= SISL_REQ_FLAGS_AFU_CMD
;
1914 cmd
->rcb
.ctx_id
= afu
->ctx_hndl
;
1915 cmd
->rcb
.msi
= SISL_MSI_RRQ_UPDATED
;
1916 cmd
->rcb
.timeout
= MC_AFU_SYNC_TIMEOUT
;
1918 cmd
->rcb
.cdb
[0] = 0xC0; /* AFU Sync */
1919 cmd
->rcb
.cdb
[1] = mode
;
1921 /* The cdb is aligned, no unaligned accessors required */
1922 *((__be16
*)&cmd
->rcb
.cdb
[2]) = cpu_to_be16(ctx_hndl_u
);
1923 *((__be32
*)&cmd
->rcb
.cdb
[4]) = cpu_to_be32(res_hndl_u
);
1925 rc
= afu
->send_cmd(afu
, cmd
);
1929 rc
= wait_resp(afu
, cmd
);
1933 atomic_dec(&afu
->cmds_active
);
1934 mutex_unlock(&sync_active
);
1936 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1941 * afu_reset() - resets the AFU
1942 * @cfg: Internal structure associated with the host.
1944 * Return: 0 on success, -errno on failure
1946 static int afu_reset(struct cxlflash_cfg
*cfg
)
1948 struct device
*dev
= &cfg
->dev
->dev
;
1951 /* Stop the context before the reset. Since the context is
1952 * no longer available restart it after the reset is complete
1958 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
1963 * drain_ioctls() - wait until all currently executing ioctls have completed
1964 * @cfg: Internal structure associated with the host.
1966 * Obtain write access to read/write semaphore that wraps ioctl
1967 * handling to 'drain' ioctls currently executing.
1969 static void drain_ioctls(struct cxlflash_cfg
*cfg
)
1971 down_write(&cfg
->ioctl_rwsem
);
1972 up_write(&cfg
->ioctl_rwsem
);
1976 * cxlflash_eh_device_reset_handler() - reset a single LUN
1977 * @scp: SCSI command to send.
1980 * SUCCESS as defined in scsi/scsi.h
1981 * FAILED as defined in scsi/scsi.h
1983 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd
*scp
)
1986 struct Scsi_Host
*host
= scp
->device
->host
;
1987 struct cxlflash_cfg
*cfg
= shost_priv(host
);
1988 struct device
*dev
= &cfg
->dev
->dev
;
1989 struct afu
*afu
= cfg
->afu
;
1992 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
1993 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
1994 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
1995 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
1996 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
1997 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
1998 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2001 switch (cfg
->state
) {
2003 rcr
= send_tmf(afu
, scp
, TMF_LUN_RESET
);
2008 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2015 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2020 * cxlflash_eh_host_reset_handler() - reset the host adapter
2021 * @scp: SCSI command from stack identifying host.
2023 * Following a reset, the state is evaluated again in case an EEH occurred
2024 * during the reset. In such a scenario, the host reset will either yield
2025 * until the EEH recovery is complete or return success or failure based
2026 * upon the current device state.
2029 * SUCCESS as defined in scsi/scsi.h
2030 * FAILED as defined in scsi/scsi.h
2032 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd
*scp
)
2036 struct Scsi_Host
*host
= scp
->device
->host
;
2037 struct cxlflash_cfg
*cfg
= shost_priv(host
);
2038 struct device
*dev
= &cfg
->dev
->dev
;
2040 dev_dbg(dev
, "%s: (scp=%p) %d/%d/%d/%llu "
2041 "cdb=(%08x-%08x-%08x-%08x)\n", __func__
, scp
, host
->host_no
,
2042 scp
->device
->channel
, scp
->device
->id
, scp
->device
->lun
,
2043 get_unaligned_be32(&((u32
*)scp
->cmnd
)[0]),
2044 get_unaligned_be32(&((u32
*)scp
->cmnd
)[1]),
2045 get_unaligned_be32(&((u32
*)scp
->cmnd
)[2]),
2046 get_unaligned_be32(&((u32
*)scp
->cmnd
)[3]));
2048 switch (cfg
->state
) {
2050 cfg
->state
= STATE_RESET
;
2052 cxlflash_mark_contexts_error(cfg
);
2053 rcr
= afu_reset(cfg
);
2056 cfg
->state
= STATE_FAILTERM
;
2058 cfg
->state
= STATE_NORMAL
;
2059 wake_up_all(&cfg
->reset_waitq
);
2063 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
);
2064 if (cfg
->state
== STATE_NORMAL
)
2072 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2077 * cxlflash_change_queue_depth() - change the queue depth for the device
2078 * @sdev: SCSI device destined for queue depth change.
2079 * @qdepth: Requested queue depth value to set.
2081 * The requested queue depth is capped to the maximum supported value.
2083 * Return: The actual queue depth set.
2085 static int cxlflash_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2088 if (qdepth
> CXLFLASH_MAX_CMDS_PER_LUN
)
2089 qdepth
= CXLFLASH_MAX_CMDS_PER_LUN
;
2091 scsi_change_queue_depth(sdev
, qdepth
);
2092 return sdev
->queue_depth
;
2096 * cxlflash_show_port_status() - queries and presents the current port status
2097 * @port: Desired port for status reporting.
2098 * @cfg: Internal structure associated with the host.
2099 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2101 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2103 static ssize_t
cxlflash_show_port_status(u32 port
,
2104 struct cxlflash_cfg
*cfg
,
2107 struct device
*dev
= &cfg
->dev
->dev
;
2110 __be64 __iomem
*fc_port_regs
;
2112 WARN_ON(port
>= MAX_FC_PORTS
);
2114 if (port
>= cfg
->num_fc_ports
) {
2115 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2120 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2121 status
= readq_be(&fc_port_regs
[FC_MTIP_STATUS
/ 8]);
2122 status
&= FC_MTIP_STATUS_MASK
;
2124 if (status
== FC_MTIP_STATUS_ONLINE
)
2125 disp_status
= "online";
2126 else if (status
== FC_MTIP_STATUS_OFFLINE
)
2127 disp_status
= "offline";
2129 disp_status
= "unknown";
2131 return scnprintf(buf
, PAGE_SIZE
, "%s\n", disp_status
);
2135 * port0_show() - queries and presents the current status of port 0
2136 * @dev: Generic device associated with the host owning the port.
2137 * @attr: Device attribute representing the port.
2138 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2140 * Return: The size of the ASCII string returned in @buf.
2142 static ssize_t
port0_show(struct device
*dev
,
2143 struct device_attribute
*attr
,
2146 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2148 return cxlflash_show_port_status(0, cfg
, buf
);
2152 * port1_show() - queries and presents the current status of port 1
2153 * @dev: Generic device associated with the host owning the port.
2154 * @attr: Device attribute representing the port.
2155 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2157 * Return: The size of the ASCII string returned in @buf.
2159 static ssize_t
port1_show(struct device
*dev
,
2160 struct device_attribute
*attr
,
2163 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2165 return cxlflash_show_port_status(1, cfg
, buf
);
2169 * port2_show() - queries and presents the current status of port 2
2170 * @dev: Generic device associated with the host owning the port.
2171 * @attr: Device attribute representing the port.
2172 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2174 * Return: The size of the ASCII string returned in @buf.
2176 static ssize_t
port2_show(struct device
*dev
,
2177 struct device_attribute
*attr
,
2180 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2182 return cxlflash_show_port_status(2, cfg
, buf
);
2186 * port3_show() - queries and presents the current status of port 3
2187 * @dev: Generic device associated with the host owning the port.
2188 * @attr: Device attribute representing the port.
2189 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2191 * Return: The size of the ASCII string returned in @buf.
2193 static ssize_t
port3_show(struct device
*dev
,
2194 struct device_attribute
*attr
,
2197 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2199 return cxlflash_show_port_status(3, cfg
, buf
);
2203 * lun_mode_show() - presents the current LUN mode of the host
2204 * @dev: Generic device associated with the host.
2205 * @attr: Device attribute representing the LUN mode.
2206 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII.
2208 * Return: The size of the ASCII string returned in @buf.
2210 static ssize_t
lun_mode_show(struct device
*dev
,
2211 struct device_attribute
*attr
, char *buf
)
2213 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2214 struct afu
*afu
= cfg
->afu
;
2216 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->internal_lun
);
2220 * lun_mode_store() - sets the LUN mode of the host
2221 * @dev: Generic device associated with the host.
2222 * @attr: Device attribute representing the LUN mode.
2223 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII.
2224 * @count: Length of data resizing in @buf.
2226 * The CXL Flash AFU supports a dummy LUN mode where the external
2227 * links and storage are not required. Space on the FPGA is used
2228 * to create 1 or 2 small LUNs which are presented to the system
2229 * as if they were a normal storage device. This feature is useful
2230 * during development and also provides manufacturing with a way
2231 * to test the AFU without an actual device.
2233 * 0 = external LUN[s] (default)
2234 * 1 = internal LUN (1 x 64K, 512B blocks, id 0)
2235 * 2 = internal LUN (1 x 64K, 4K blocks, id 0)
2236 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1)
2237 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1)
2239 * Return: The size of the ASCII string returned in @buf.
2241 static ssize_t
lun_mode_store(struct device
*dev
,
2242 struct device_attribute
*attr
,
2243 const char *buf
, size_t count
)
2245 struct Scsi_Host
*shost
= class_to_shost(dev
);
2246 struct cxlflash_cfg
*cfg
= shost_priv(shost
);
2247 struct afu
*afu
= cfg
->afu
;
2251 rc
= kstrtouint(buf
, 10, &lun_mode
);
2252 if (!rc
&& (lun_mode
< 5) && (lun_mode
!= afu
->internal_lun
)) {
2253 afu
->internal_lun
= lun_mode
;
2256 * When configured for internal LUN, there is only one channel,
2257 * channel number 0, else there will be one less than the number
2258 * of fc ports for this card.
2260 if (afu
->internal_lun
)
2261 shost
->max_channel
= 0;
2263 shost
->max_channel
= PORTNUM2CHAN(cfg
->num_fc_ports
);
2266 scsi_scan_host(cfg
->host
);
2273 * ioctl_version_show() - presents the current ioctl version of the host
2274 * @dev: Generic device associated with the host.
2275 * @attr: Device attribute representing the ioctl version.
2276 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version.
2278 * Return: The size of the ASCII string returned in @buf.
2280 static ssize_t
ioctl_version_show(struct device
*dev
,
2281 struct device_attribute
*attr
, char *buf
)
2283 return scnprintf(buf
, PAGE_SIZE
, "%u\n", DK_CXLFLASH_VERSION_0
);
2287 * cxlflash_show_port_lun_table() - queries and presents the port LUN table
2288 * @port: Desired port for status reporting.
2289 * @cfg: Internal structure associated with the host.
2290 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2292 * Return: The size of the ASCII string returned in @buf or -EINVAL.
2294 static ssize_t
cxlflash_show_port_lun_table(u32 port
,
2295 struct cxlflash_cfg
*cfg
,
2298 struct device
*dev
= &cfg
->dev
->dev
;
2299 __be64 __iomem
*fc_port_luns
;
2303 WARN_ON(port
>= MAX_FC_PORTS
);
2305 if (port
>= cfg
->num_fc_ports
) {
2306 dev_info(dev
, "%s: Port %d not supported on this card.\n",
2311 fc_port_luns
= get_fc_port_luns(cfg
, port
);
2313 for (i
= 0; i
< CXLFLASH_NUM_VLUNS
; i
++)
2314 bytes
+= scnprintf(buf
+ bytes
, PAGE_SIZE
- bytes
,
2316 i
, readq_be(&fc_port_luns
[i
]));
2321 * port0_lun_table_show() - presents the current LUN table of port 0
2322 * @dev: Generic device associated with the host owning the port.
2323 * @attr: Device attribute representing the port.
2324 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2326 * Return: The size of the ASCII string returned in @buf.
2328 static ssize_t
port0_lun_table_show(struct device
*dev
,
2329 struct device_attribute
*attr
,
2332 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2334 return cxlflash_show_port_lun_table(0, cfg
, buf
);
2338 * port1_lun_table_show() - presents the current LUN table of port 1
2339 * @dev: Generic device associated with the host owning the port.
2340 * @attr: Device attribute representing the port.
2341 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2343 * Return: The size of the ASCII string returned in @buf.
2345 static ssize_t
port1_lun_table_show(struct device
*dev
,
2346 struct device_attribute
*attr
,
2349 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2351 return cxlflash_show_port_lun_table(1, cfg
, buf
);
2355 * port2_lun_table_show() - presents the current LUN table of port 2
2356 * @dev: Generic device associated with the host owning the port.
2357 * @attr: Device attribute representing the port.
2358 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2360 * Return: The size of the ASCII string returned in @buf.
2362 static ssize_t
port2_lun_table_show(struct device
*dev
,
2363 struct device_attribute
*attr
,
2366 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2368 return cxlflash_show_port_lun_table(2, cfg
, buf
);
2372 * port3_lun_table_show() - presents the current LUN table of port 3
2373 * @dev: Generic device associated with the host owning the port.
2374 * @attr: Device attribute representing the port.
2375 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII.
2377 * Return: The size of the ASCII string returned in @buf.
2379 static ssize_t
port3_lun_table_show(struct device
*dev
,
2380 struct device_attribute
*attr
,
2383 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2385 return cxlflash_show_port_lun_table(3, cfg
, buf
);
2389 * irqpoll_weight_show() - presents the current IRQ poll weight for the host
2390 * @dev: Generic device associated with the host.
2391 * @attr: Device attribute representing the IRQ poll weight.
2392 * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll
2395 * An IRQ poll weight of 0 indicates polling is disabled.
2397 * Return: The size of the ASCII string returned in @buf.
2399 static ssize_t
irqpoll_weight_show(struct device
*dev
,
2400 struct device_attribute
*attr
, char *buf
)
2402 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2403 struct afu
*afu
= cfg
->afu
;
2405 return scnprintf(buf
, PAGE_SIZE
, "%u\n", afu
->irqpoll_weight
);
2409 * irqpoll_weight_store() - sets the current IRQ poll weight for the host
2410 * @dev: Generic device associated with the host.
2411 * @attr: Device attribute representing the IRQ poll weight.
2412 * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll
2414 * @count: Length of data resizing in @buf.
2416 * An IRQ poll weight of 0 indicates polling is disabled.
2418 * Return: The size of the ASCII string returned in @buf.
2420 static ssize_t
irqpoll_weight_store(struct device
*dev
,
2421 struct device_attribute
*attr
,
2422 const char *buf
, size_t count
)
2424 struct cxlflash_cfg
*cfg
= shost_priv(class_to_shost(dev
));
2425 struct device
*cfgdev
= &cfg
->dev
->dev
;
2426 struct afu
*afu
= cfg
->afu
;
2430 rc
= kstrtouint(buf
, 10, &weight
);
2436 "Invalid IRQ poll weight. It must be 256 or less.\n");
2440 if (weight
== afu
->irqpoll_weight
) {
2442 "Current IRQ poll weight has the same weight.\n");
2446 if (afu_is_irqpoll_enabled(afu
))
2447 irq_poll_disable(&afu
->irqpoll
);
2449 afu
->irqpoll_weight
= weight
;
2452 irq_poll_init(&afu
->irqpoll
, weight
, cxlflash_irqpoll
);
2458 * mode_show() - presents the current mode of the device
2459 * @dev: Generic device associated with the device.
2460 * @attr: Device attribute representing the device mode.
2461 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII.
2463 * Return: The size of the ASCII string returned in @buf.
2465 static ssize_t
mode_show(struct device
*dev
,
2466 struct device_attribute
*attr
, char *buf
)
2468 struct scsi_device
*sdev
= to_scsi_device(dev
);
2470 return scnprintf(buf
, PAGE_SIZE
, "%s\n",
2471 sdev
->hostdata
? "superpipe" : "legacy");
2477 static DEVICE_ATTR_RO(port0
);
2478 static DEVICE_ATTR_RO(port1
);
2479 static DEVICE_ATTR_RO(port2
);
2480 static DEVICE_ATTR_RO(port3
);
2481 static DEVICE_ATTR_RW(lun_mode
);
2482 static DEVICE_ATTR_RO(ioctl_version
);
2483 static DEVICE_ATTR_RO(port0_lun_table
);
2484 static DEVICE_ATTR_RO(port1_lun_table
);
2485 static DEVICE_ATTR_RO(port2_lun_table
);
2486 static DEVICE_ATTR_RO(port3_lun_table
);
2487 static DEVICE_ATTR_RW(irqpoll_weight
);
2489 static struct device_attribute
*cxlflash_host_attrs
[] = {
2495 &dev_attr_ioctl_version
,
2496 &dev_attr_port0_lun_table
,
2497 &dev_attr_port1_lun_table
,
2498 &dev_attr_port2_lun_table
,
2499 &dev_attr_port3_lun_table
,
2500 &dev_attr_irqpoll_weight
,
2507 static DEVICE_ATTR_RO(mode
);
2509 static struct device_attribute
*cxlflash_dev_attrs
[] = {
2517 static struct scsi_host_template driver_template
= {
2518 .module
= THIS_MODULE
,
2519 .name
= CXLFLASH_ADAPTER_NAME
,
2520 .info
= cxlflash_driver_info
,
2521 .ioctl
= cxlflash_ioctl
,
2522 .proc_name
= CXLFLASH_NAME
,
2523 .queuecommand
= cxlflash_queuecommand
,
2524 .eh_device_reset_handler
= cxlflash_eh_device_reset_handler
,
2525 .eh_host_reset_handler
= cxlflash_eh_host_reset_handler
,
2526 .change_queue_depth
= cxlflash_change_queue_depth
,
2527 .cmd_per_lun
= CXLFLASH_MAX_CMDS_PER_LUN
,
2528 .can_queue
= CXLFLASH_MAX_CMDS
,
2529 .cmd_size
= sizeof(struct afu_cmd
) + __alignof__(struct afu_cmd
) - 1,
2531 .sg_tablesize
= 1, /* No scatter gather support */
2532 .max_sectors
= CXLFLASH_MAX_SECTORS
,
2533 .use_clustering
= ENABLE_CLUSTERING
,
2534 .shost_attrs
= cxlflash_host_attrs
,
2535 .sdev_attrs
= cxlflash_dev_attrs
,
2539 * Device dependent values
2541 static struct dev_dependent_vals dev_corsa_vals
= { CXLFLASH_MAX_SECTORS
,
2543 static struct dev_dependent_vals dev_flash_gt_vals
= { CXLFLASH_MAX_SECTORS
,
2544 CXLFLASH_NOTIFY_SHUTDOWN
};
2545 static struct dev_dependent_vals dev_briard_vals
= { CXLFLASH_MAX_SECTORS
,
2546 CXLFLASH_NOTIFY_SHUTDOWN
};
2549 * PCI device binding table
2551 static struct pci_device_id cxlflash_pci_table
[] = {
2552 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_CORSA
,
2553 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_corsa_vals
},
2554 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_FLASH_GT
,
2555 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_flash_gt_vals
},
2556 {PCI_VENDOR_ID_IBM
, PCI_DEVICE_ID_IBM_BRIARD
,
2557 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, (kernel_ulong_t
)&dev_briard_vals
},
2561 MODULE_DEVICE_TABLE(pci
, cxlflash_pci_table
);
2564 * cxlflash_worker_thread() - work thread handler for the AFU
2565 * @work: Work structure contained within cxlflash associated with host.
2567 * Handles the following events:
2568 * - Link reset which cannot be performed on interrupt context due to
2569 * blocking up to a few seconds
2572 static void cxlflash_worker_thread(struct work_struct
*work
)
2574 struct cxlflash_cfg
*cfg
= container_of(work
, struct cxlflash_cfg
,
2576 struct afu
*afu
= cfg
->afu
;
2577 struct device
*dev
= &cfg
->dev
->dev
;
2578 __be64 __iomem
*fc_port_regs
;
2582 /* Avoid MMIO if the device has failed */
2584 if (cfg
->state
!= STATE_NORMAL
)
2587 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2589 if (cfg
->lr_state
== LINK_RESET_REQUIRED
) {
2590 port
= cfg
->lr_port
;
2592 dev_err(dev
, "%s: invalid port index %d\n",
2595 spin_unlock_irqrestore(cfg
->host
->host_lock
,
2598 /* The reset can block... */
2599 fc_port_regs
= get_fc_port_regs(cfg
, port
);
2600 afu_link_reset(afu
, port
, fc_port_regs
);
2601 spin_lock_irqsave(cfg
->host
->host_lock
, lock_flags
);
2604 cfg
->lr_state
= LINK_RESET_COMPLETE
;
2607 spin_unlock_irqrestore(cfg
->host
->host_lock
, lock_flags
);
2609 if (atomic_dec_if_positive(&cfg
->scan_host_needed
) >= 0)
2610 scsi_scan_host(cfg
->host
);
2614 * cxlflash_probe() - PCI entry point to add host
2615 * @pdev: PCI device associated with the host.
2616 * @dev_id: PCI device id associated with device.
2618 * The device will initially start out in a 'probing' state and
2619 * transition to the 'normal' state at the end of a successful
2620 * probe. Should an EEH event occur during probe, the notification
2621 * thread (error_detected()) will wait until the probe handler
2622 * is nearly complete. At that time, the device will be moved to
2623 * a 'probed' state and the EEH thread woken up to drive the slot
2624 * reset and recovery (device moves to 'normal' state). Meanwhile,
2625 * the probe will be allowed to exit successfully.
2627 * Return: 0 on success, -errno on failure
2629 static int cxlflash_probe(struct pci_dev
*pdev
,
2630 const struct pci_device_id
*dev_id
)
2632 struct Scsi_Host
*host
;
2633 struct cxlflash_cfg
*cfg
= NULL
;
2634 struct device
*dev
= &pdev
->dev
;
2635 struct dev_dependent_vals
*ddv
;
2639 dev_dbg(&pdev
->dev
, "%s: Found CXLFLASH with IRQ: %d\n",
2640 __func__
, pdev
->irq
);
2642 ddv
= (struct dev_dependent_vals
*)dev_id
->driver_data
;
2643 driver_template
.max_sectors
= ddv
->max_sectors
;
2645 host
= scsi_host_alloc(&driver_template
, sizeof(struct cxlflash_cfg
));
2647 dev_err(dev
, "%s: scsi_host_alloc failed\n", __func__
);
2652 host
->max_id
= CXLFLASH_MAX_NUM_TARGETS_PER_BUS
;
2653 host
->max_lun
= CXLFLASH_MAX_NUM_LUNS_PER_TARGET
;
2654 host
->unique_id
= host
->host_no
;
2655 host
->max_cmd_len
= CXLFLASH_MAX_CDB_LEN
;
2657 cfg
= shost_priv(host
);
2659 rc
= alloc_mem(cfg
);
2661 dev_err(dev
, "%s: alloc_mem failed\n", __func__
);
2663 scsi_host_put(cfg
->host
);
2667 cfg
->init_state
= INIT_STATE_NONE
;
2669 cfg
->cxl_fops
= cxlflash_cxl_fops
;
2672 * Promoted LUNs move to the top of the LUN table. The rest stay on
2673 * the bottom half. The bottom half grows from the end (index = 255),
2674 * whereas the top half grows from the beginning (index = 0).
2676 * Initialize the last LUN index for all possible ports.
2678 cfg
->promote_lun_index
= 0;
2680 for (k
= 0; k
< MAX_FC_PORTS
; k
++)
2681 cfg
->last_lun_index
[k
] = CXLFLASH_NUM_VLUNS
/2 - 1;
2683 cfg
->dev_id
= (struct pci_device_id
*)dev_id
;
2685 init_waitqueue_head(&cfg
->tmf_waitq
);
2686 init_waitqueue_head(&cfg
->reset_waitq
);
2688 INIT_WORK(&cfg
->work_q
, cxlflash_worker_thread
);
2689 cfg
->lr_state
= LINK_RESET_INVALID
;
2691 spin_lock_init(&cfg
->tmf_slock
);
2692 mutex_init(&cfg
->ctx_tbl_list_mutex
);
2693 mutex_init(&cfg
->ctx_recovery_mutex
);
2694 init_rwsem(&cfg
->ioctl_rwsem
);
2695 INIT_LIST_HEAD(&cfg
->ctx_err_recovery
);
2696 INIT_LIST_HEAD(&cfg
->lluns
);
2698 pci_set_drvdata(pdev
, cfg
);
2700 cfg
->cxl_afu
= cxl_pci_to_afu(pdev
);
2704 dev_err(dev
, "%s: init_pci failed rc=%d\n", __func__
, rc
);
2707 cfg
->init_state
= INIT_STATE_PCI
;
2710 if (rc
&& !wq_has_sleeper(&cfg
->reset_waitq
)) {
2711 dev_err(dev
, "%s: init_afu failed rc=%d\n", __func__
, rc
);
2714 cfg
->init_state
= INIT_STATE_AFU
;
2716 rc
= init_scsi(cfg
);
2718 dev_err(dev
, "%s: init_scsi failed rc=%d\n", __func__
, rc
);
2721 cfg
->init_state
= INIT_STATE_SCSI
;
2723 if (wq_has_sleeper(&cfg
->reset_waitq
)) {
2724 cfg
->state
= STATE_PROBED
;
2725 wake_up_all(&cfg
->reset_waitq
);
2727 cfg
->state
= STATE_NORMAL
;
2729 dev_dbg(dev
, "%s: returning rc=%d\n", __func__
, rc
);
2733 cxlflash_remove(pdev
);
2738 * cxlflash_pci_error_detected() - called when a PCI error is detected
2739 * @pdev: PCI device struct.
2740 * @state: PCI channel state.
2742 * When an EEH occurs during an active reset, wait until the reset is
2743 * complete and then take action based upon the device state.
2745 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
2747 static pci_ers_result_t
cxlflash_pci_error_detected(struct pci_dev
*pdev
,
2748 pci_channel_state_t state
)
2751 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2752 struct device
*dev
= &cfg
->dev
->dev
;
2754 dev_dbg(dev
, "%s: pdev=%p state=%u\n", __func__
, pdev
, state
);
2757 case pci_channel_io_frozen
:
2758 wait_event(cfg
->reset_waitq
, cfg
->state
!= STATE_RESET
&&
2759 cfg
->state
!= STATE_PROBING
);
2760 if (cfg
->state
== STATE_FAILTERM
)
2761 return PCI_ERS_RESULT_DISCONNECT
;
2763 cfg
->state
= STATE_RESET
;
2764 scsi_block_requests(cfg
->host
);
2766 rc
= cxlflash_mark_contexts_error(cfg
);
2768 dev_err(dev
, "%s: Failed to mark user contexts rc=%d\n",
2771 return PCI_ERS_RESULT_NEED_RESET
;
2772 case pci_channel_io_perm_failure
:
2773 cfg
->state
= STATE_FAILTERM
;
2774 wake_up_all(&cfg
->reset_waitq
);
2775 scsi_unblock_requests(cfg
->host
);
2776 return PCI_ERS_RESULT_DISCONNECT
;
2780 return PCI_ERS_RESULT_NEED_RESET
;
2784 * cxlflash_pci_slot_reset() - called when PCI slot has been reset
2785 * @pdev: PCI device struct.
2787 * This routine is called by the pci error recovery code after the PCI
2788 * slot has been reset, just before we should resume normal operations.
2790 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT
2792 static pci_ers_result_t
cxlflash_pci_slot_reset(struct pci_dev
*pdev
)
2795 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2796 struct device
*dev
= &cfg
->dev
->dev
;
2798 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2802 dev_err(dev
, "%s: EEH recovery failed rc=%d\n", __func__
, rc
);
2803 return PCI_ERS_RESULT_DISCONNECT
;
2806 return PCI_ERS_RESULT_RECOVERED
;
2810 * cxlflash_pci_resume() - called when normal operation can resume
2811 * @pdev: PCI device struct
2813 static void cxlflash_pci_resume(struct pci_dev
*pdev
)
2815 struct cxlflash_cfg
*cfg
= pci_get_drvdata(pdev
);
2816 struct device
*dev
= &cfg
->dev
->dev
;
2818 dev_dbg(dev
, "%s: pdev=%p\n", __func__
, pdev
);
2820 cfg
->state
= STATE_NORMAL
;
2821 wake_up_all(&cfg
->reset_waitq
);
2822 scsi_unblock_requests(cfg
->host
);
2825 static const struct pci_error_handlers cxlflash_err_handler
= {
2826 .error_detected
= cxlflash_pci_error_detected
,
2827 .slot_reset
= cxlflash_pci_slot_reset
,
2828 .resume
= cxlflash_pci_resume
,
2832 * PCI device structure
2834 static struct pci_driver cxlflash_driver
= {
2835 .name
= CXLFLASH_NAME
,
2836 .id_table
= cxlflash_pci_table
,
2837 .probe
= cxlflash_probe
,
2838 .remove
= cxlflash_remove
,
2839 .shutdown
= cxlflash_remove
,
2840 .err_handler
= &cxlflash_err_handler
,
2844 * init_cxlflash() - module entry point
2846 * Return: 0 on success, -errno on failure
2848 static int __init
init_cxlflash(void)
2850 cxlflash_list_init();
2852 return pci_register_driver(&cxlflash_driver
);
2856 * exit_cxlflash() - module exit point
2858 static void __exit
exit_cxlflash(void)
2860 cxlflash_term_global_luns();
2861 cxlflash_free_errpage();
2863 pci_unregister_driver(&cxlflash_driver
);
2866 module_init(init_cxlflash
);
2867 module_exit(exit_cxlflash
);